"Shanghai | China says it will buy more American barley and Russian beef as part of previously agreed trade deals in a blow for Australian exports facing restrictions due to political tensions between Beijing and Canberra.Barley imports from the United States to China would be effective from this week, according to a notice on the China Customs website. (AFR 15th May 2020)
Reason for China bunging 80% tariff on Aus Barley:
IMO the reason China bunged 80% import on Aus barley imports was because of the Trump Trade deal with China which, among other commodities gave preferential US farmer access to the China Market: